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UP: Umweltphysik
UP 12: Instrumentelles und Laborexperimente - Poster
UP 12.5: Poster
Monday, March 18, 2002, 16:30–18:00, Galerie 1
An Intercomparison of Airborne VOC measurements — •Armin Wisthaler1, Armin Hansel1, Ray Fall2, Paul D. Goldan3, Gerhard Hübler3, and Fred C. Fehsenfeld3 — 1Institut für Ionenphysik, Universität Innsbruck — 2Department of Biochemistry, University of Colorado-Boulder — 3Aeronomy Laboratory, NOAA, Boulder
During the Texas Air Quality Study (TexAQS) 2000 ambient air samples were analyzed on-board the NSF/NCAR ELECTRA research aircraft by two VOC measurement techniques: 1) an in-situ gas chromatograph named TACOH (Tropospheric Airborne Chromatograph for Oxy-hydrocarbons and Hydrocarbons), operated by NOAA’s Aeronomy Laboratory, and 2) a chemical ionization mass spectrometer named PTR-MS (Proton-Transfer-Reaction Mass Spectrometer) and operated by the University of Innsbruck. The sample protocols were quite different for the two methods: the TACOH system collected air samples for 15-60 sec (depending upon altitude) every 15 min, the PTR-MS system monitored selected VOCs on a time-shared basis for 2 sec respectively, once every 4-20 sec, depending upon the number of monitored species. Simultaneous measurements of acetaldehyde, isoprene, the sum* of acetone and propanal, the sum* of methyl vinyl ketone and methacrolein (* PTR-MS does not distinguish between isobaric species) and toluene show good agreement despite being performed in the complex and highly polluted Houston air matrix.